Nanocrystal Corporation

Nanocrystal Corporation Patent applications

Patent application number

Title

Published

20110140072

DEFECT-FREE GROUP III - NITRIDE NANOSTRUCTURES AND DEVICES USING PULSED AND NON-PULSED GROWTH TECHNIQUES - Exemplary embodiments provide semiconductor devices including high-quality (i.e., defect free) Group III—Nitride nanostructures and uniform Group III—Nitride nanostructure arrays as well as their scalable processes for manufacturing, where the position, orientation, cross-sectional features, length and the crystallinity of each nanostructure can be precisely controlled. A pulsed growth mode can be used to fabricate the disclosed Group III—Nitride nanostructures and/or nanostructure arrays providing a uniform length of about 0.01-20 micrometers (μm) with constant cross-sectional features including an exemplary diameter of about 10 nanometers (nm)-500 micrometers (μm). Furthermore, core-shell nanostructure/MQW active structures can be formed by a core-shell growth on the non-polar sidewalls of each nanostructure and can be configured in nanoscale photoelectronic devices such as nanostructure LEDs and/or nanostructure lasers to provide tremendously-high efficiencies. Additional growth mode transitions from the pulsed to the non-pulsed growth mode and subsequent transitions from non-pulsed to pulsed growth mode are employed in order to incorporate certain group III—Nitride compounds more efficiently into the nanostructures and form devices of the designed shape, morphology and stochiometric composition. In addition, high-quality group III—Nitride substrate structures can be formed by coalescing the plurality of group III—Nitride nanostructures and/or nanostructure arrays to facilitate the fabrication of visible LEDs and lasers.